Improvement in preventing incrustation in steam-boilers



-,e1te tstes gaunt ffxrr.

HUGH McQU-A-ID, or CANYON CITY, OREGON.

Letters Patent No. 82,859, dated October 6, 1868.

IMPROVEMENT IN PREVENTING INGRUSTATION IN STEAM-BOILERS.

TO'ALL WHOM IT MAY CONCERN:

Be it known that I, HUGH McQUAID, a citizen of the United States, and resident of Grant county, State of Oregon, have discovered and invented a new and improved Mode of Preventing Steam-Boilers from hometation and I do declare the following to be a full, clear, and exact description thereof.

The nature of my invention consists in galvanizing or plating the iron of the steam-boiler withcoppergand polishing the sameto brightness, and coating with quicksilver the parts liable to incrustation. The quicksilver will expand as the water increases in heat, till it has attained 212 of Fahrenheit, then steam forms. The ironof the bottom of the boiler is cold, in contact with the fire of the furnace. The mercury then contracts, and

is not again subject to heat till the steam has passedofl' or the water become exhausted in the boilers. Quich silver being a. liquidon the parts of the boiler and heaters liable to incrustation, and being larger in volume by increase of heat, it contracts after steam has formed, and vice versa, the sediment remains free.

- produce the intended effect.

To enable others skilled in the art to make and use my invention, I will proceed to fully stateits construction and operation.

I construct my steam boiler in any of the known forms, and apply thereto gauge-cocks, a'safety valve, and

the other appendages of such boilers. But, in order to obviate the danger arising from incrustation, I cause the" iron of. the bottom and inside parts, liable to incrustation, to be plated with copper, -and cleanse the same with nitric acid, and polish the eopperto brightness, and on the polished surface I spread an equal coat of quicksilver. This beingdone, my boiler is ready for use. s I

What I claim as my invention, and desire to secure by Letters Patent, is The application in steam-boilers of an amalgamated surface to the parts liable to incrustatidn, the iron plated with copper being coated with quicksilver, and being a liquid, on the surface of the copper, expands, as

herein set forth, using for that purpose the aforesaid metals, or any other substantially the same, whichwill HUGH. McQUAID.

Witnesses:

F. J. Knve,

Jomv L. MILLER. 

